i have a HDC i'm working with.
i do WindowFromDC and get a HWND. then after a while
if i do again WindowFromDC on the same HDC. i get a
different HWND then the previous.
in between the two actions i mostly draw and sometime
create a memhdc and release it. i don't have more then 2
HDC at a time so there is probably no error of overwriting
the HDC and besides the only thing that is changed is the HWND